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Finding the Fourth Proportional to 817.19, 1,226.04 and 261.98

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Solution

The fourth proportional to 817.19, 1,226.04 and 261.98 is: 393.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.19 : 1,226.04 = 261.98 : x
  2. Step 2: Convert to fraction form
    817.19/1,226.04 = 261.98/x
  3. Step 3: Cross multiply
    817.19x = 1,226.04 × 261.98
  4. Step 4: Simplify right side
    817.19x = 321,197.96
  5. Step 5: Solve for x
    x = 321,197.96/817.19
  6. Step 6: Final answer
    x = 393.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.